Sleuthing out exotic quantum spin liquidity in the pyrochlore magnet Ce2Zr2O7
Sleuthing out exotic quantum spin liquidity in the pyrochlore magnet Ce2Zr2O7
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DOI：
10.1038/s41535-022-00458-2
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发表时间：
2022-05-02
影响因子：
5.7
通讯作者：
Changlani, Hitesh J.
中科院分区：
文献类型：
--
作者：
Bhardwaj, Anish;Zhang, Shu;Changlani, Hitesh J.
对量子自旋液体--具有分数激发的拓扑磁体--的探索一直是凝聚态和材料物理学的中心主题。尽管有许多理论建议，但将实验与展示强大量子自旋液体的详细理论联系起来仍然是一个核心挑战。在这里，专注于强自旋轨道耦合的有效S = 1/2烧绿石磁体Ce 2 Zr 2 O 7，我们分析最近的热力学和中子散射实验，通过有限温度Lanczos，Monte Carlo和分析自旋动力学计算相结合，以确定一个微观有效的哈密顿量。它的参数值表明存在一种奇异相，一种π通量U（1）量子自旋液体。有趣的是，八极矩的性质使它们不太容易受到磁无序的影响，同时也隐藏了中子的一些其他特征，使这种自旋液体可以说比更传统的对应物更稳定。
The search for quantum spin liquids-topological magnets with fractionalized excitations-has been a central theme in condensed matter and materials physics. Despite numerous theoretical proposals, connecting experiment with detailed theory exhibiting a robust quantum spin liquid has remained a central challenge. Here, focusing on the strongly spin-orbit coupled effective S = 1/2 pyrochlore magnet Ce2Zr2O7, we analyze recent thermodynamic and neutron-scattering experiments, to identify a microscopic effective Hamiltonian through a combination of finite temperature Lanczos, Monte Carlo, and analytical spin dynamics calculations. Its parameter values suggest the existence of an exotic phase, a pi-flux U(1) quantum spin liquid. Intriguingly, the octupolar nature of the moments makes them less prone to be affected by magnetic disorder, while also hiding some otherwise characteristic signatures from neutrons, making this spin liquid arguably more stable than its more conventional counterparts.